Pile-driving head.



G. P. BOHLAND.

PILE DRIVING HEAD.

APPLICATION FILED AUG.19, 1911.

Patented Apr. 16, 1912.

COLUMBIA PMNOURAFH C0.. WASHINGTON. D, c.

rree

CARL P. BOHLAND, OF SEATTLE, WASHINGTON.

PILE-DRIVING- HEAD.

Specicaton of Letters Patent.

Patented Apr. 16, 1912.

Application tiled August 19, 1911. Serial No. 644,982.

To all whomy t may concern.'

Be it known that I, CARL P. Boi-ILAND, of Seattle, in the county of King and 'State of IVashington, have invented certain new and useful Improvements in Pile-Driving Heads; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable othersl skilled in the art to which it appertains to make and use the same.

The primary object of this invention is to provide a driving head for sheet steel piling, and especially fo-r piling which has to be placed beneath chords and stringers of bridges over which traffic is maintained during the construction or replacement of the sub-structure, or under any condition where there is a comparatively small clearance between the bottom of the stringers supporting the super-structure and the top of the piling.

A further object is to provide a driving head of the character stated which may be used without requiring any alteration in the formation of the steel sheets to adapt the device thereto.

A further object is to so construc-t the driving head that it may in part form one of the leaders for the hammer, thus economizing space and time. And a further object is to avoid all possibility of the sheet steel piling being bent by the blows of the hammer.

The invention will be hereinafter fully set forth and particularly pointed out in the claims. l

In the accompanying drawings Figure l is a diagrammatic view showing the use of my invention. Fig. 2 is an enlarged side elevation of the device detached. Fig. 3 is a view at right angles to Fig. 2. Fig. 4 is a section on line 441, Fig. 2. Fig. 5 is a section on line 5 5, Fig. 3.

Referring to the drawings, l designates a vertically disposed arm; and 2 a hook at the upper end thereof having a short downwardly extending vertical portion 3 which parallels the arm and is designed to fit over and inclose a portion of the upper end of a sheet piling, the space formed by the hook conforming in cross-section to t-he cross-section of the piling.

4 is a cushioned block carried by the arm ata point some distance above its lower end and on the side opposite the hook, and this block is designed to receive the blows of the hammer. It is located as shown to avoid the sheet being bent by the blows of the hammer, and to insure the downward movement of the sheet on a straight line.

Preferably the arm l is composed of a T- rail 5 to the opposite sides of which are riveted, or otherwise secured, parallel bars 6, the vertical edges of which with the ball 7 of the rail form a vertical guideway. The hook 2 is formed by carrying the side bars 6 beyond the upper end of the T-rail and bending them upon themselves. Fillers 7a are interposed between the web of the rail and bars 6. At its lower end the arm is bent outwardly and terminates in a diagonal extension 8 to the outer end of which and to the vertical portions of the side bars 6 are riveted angle-irons 9 forming hori- Zontal seats for the cushion of block 4. This cushion is shown as composed of upper and lower metal plates 10 and a series of interposed sections l2 of wood, all held together and to the angle-irons 9 by bolts 13. To the top plate l0 are riveted four angle-irons 14 which form a socket to accommodate block 4. It will be observed that this block is thus located at a point some distance above the extreme lower end of the device and that a bearing is provided between the latter and the piling beyond the point at which the hammer strikes thus effectively distributing the force of the blow and avoiding bending the sheet, which will be moved downward on a straight line under the blows of the hammer. Furthermore, by bending outwardly the lower end of the arm and bracing such end a firm seat is obtained for the cushioned block. The absence of resiliency in the steel sheets is compensated for by cushioning the block.

In practice, the hooked end of the arm is caused to engage the upper edge of the sheet piling so that the arm will extend down over either face thereof, and t-he cushioned block being some distance from the upper end, ample room is provided for the travel of the hammer without being obstructed by an overhead structure. The leaders for the hammer may be placed on opposite sides of the device` as customary. or when circumstances permit of the use of only one leader the guideway formed by the ball of the rail and the bars 6 may be employed as the complementary leader. In Fig. l I have shown a single leader at 1G; and the hammer 17 as guided by the single leader 16 and also by the rail and bars. A hoisting-rope 18 for the hammer is shown in Fig. 1.

I have shown a bail at 19, Figs. 2 and 3, to' which an elevating cable (not shown) may be attached for controlling the device. It will be noted that the latter may be used without altering the piling sheets in the slightest, and in consequence after the device has been removed from a driven sheet a second sheet may be secured to the upper end of the lower sheet if desired or necessary. It is understood that in practice ad jacent edges of the sheets interlock, but each sheet is permitted tomove longitudinally, under the hammer blows, independently of the adjacent sheets, and hence my device may be applied to any sheet to effect the downward movement thereof without interfering with any of the remaining sheets.

I claim as my invention:

1. A driving-head for sheet steel piling comprising a vertically disposed arm having a hook at its upper end for extending over and taking in the upper end of a metal sheet piling, and a hammer-receiving cushioned block carried by said arm at a point some distance above its lower end, said arm having a bearing surface engaging the piling for some distance beneath the block.

2. A driving-head for sheet steel piling comprising a vertically disposed arm hooked at its upper end to engage the upper end of a sheet piling and bent outwardly and diagonally upward forming an extension at its lower end, Va seat secured to said arm and its extension, a blow-receiving block, and a cushion therefor interposedbetween the block and the seat.

3. A driving-head for sheet steel piling comprising a vertically disposed arm hooked at its upper end to engage the upper end of a sheet piling, said arm forming a guideway, a block mounted on said arm and projecting laterally therefrom, and a hammer guided by said arm and deslgned t0 engage said block.

L1. A driving-head for Sheet steel piling comprising a vertically disposed membei parallel bars secured to the opposite side of the member to form in connect-ion with the latter avvertical guideway, said han being hooked at their upper ends to engage a piling sheet, and said member and bars being outwardly and upwardly extended at their lower ends, plates secured to saideX- tension and to said bars forming a seat, a block, a cushion therefor interposed between the block and said seat, and means for securing the cushion to the seat.

In testimony whereof, I have signed this specification in the presence oftwo subscribing witnesses.

CARL RBOI-ILAND.

Witnesses:

R. C. JAMIEsoN, J. G. AUSTIN.

Jopies Commissioner of Patents,

Washington, D. C. 

